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Heat capacity under pressure of CeCoIn5

MPS-Authors
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Lengyel,  E.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Borth,  R.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sparn,  G.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Lengyel, E., Borth, R., Pagliuso, P. G., Sarrao, J., Sparn, G., Steglich, F., et al. (2002). Heat capacity under pressure of CeCoIn5. High Pressure Research, 22(1 Sp. Iss. SI), 185-187. doi:10.1080/08957950211369.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-316B-7
Abstract
Among heavy-fermion (HF) superconductors, CeCoIn5 exhibits a record high value of T-c = 2.3 K at ambient pressure [1]. CeCoIn5 belongs to a new class of HF-superconductors that crystallize in the tetragonal HoCoGa5-structure. This structure can be regarded as alternating layers of CeIn3 and CoIn2. Bulk CeIn3 undergoes a transition from an antiferromagnetic (AFM) state at ambient pressure (T-N = 10.2 K) to a superconducting state with very low T-C = 0.15 K at a critical pressure p(c) = 2.8 GPa [2] at which long range magnetic order vanishes. It is, therefore, regarded as a possible candidate for magnetically mediated superconductivity (SC). We report on measurements of the heat capacity of CeCoIn5 at hydrostatic pressures p less than or equal to 1.5 GPa. While T-c increases with increasing pressure, the effective mass of the quasi-particles m(eff) decreases, as indicated by the ratio C/T\(Tc). As a working hypothesis based on theories of a nearly antiferromagnetic Fermi-liquid (NAFFL), this may be interpreted as the stabilization of the superconducting state by an increase of the characteristic spin fluctuation temperature T-SF (T-SF proportional tok(F)(2)/m(eff)).